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    <title>Coverage for /home/zjh/.virtualenvs/h4/lib/python2.7/site-packages/django/db/backends/base/operations.py: 43%</title>
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        <h1>Coverage for <b>/home/zjh/.virtualenvs/h4/lib/python2.7/site-packages/django/db/backends/base/operations.py</b> :
            <span class="pc_cov">43%</span>
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            179 statements &nbsp;
            <span class="run hide_run shortkey_r button_toggle_run">77 run</span>
            <span class="mis shortkey_m button_toggle_mis">102 missing</span>
            <span class="exc shortkey_x button_toggle_exc">0 excluded</span>

            
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<p id="n508" class="stm mis"><a href="#n508">508</a></p>
<p id="n509" class="stm mis"><a href="#n509">509</a></p>
<p id="n510" class="stm mis"><a href="#n510">510</a></p>
<p id="n511" class="stm mis"><a href="#n511">511</a></p>
<p id="n512" class="stm mis"><a href="#n512">512</a></p>
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<p id="n523" class="stm mis"><a href="#n523">523</a></p>
<p id="n524" class="stm mis"><a href="#n524">524</a></p>
<p id="n525" class="stm mis"><a href="#n525">525</a></p>
<p id="n526" class="stm mis"><a href="#n526">526</a></p>
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<p id="n529" class="stm mis"><a href="#n529">529</a></p>
<p id="n530" class="pln"><a href="#n530">530</a></p>
<p id="n531" class="stm run hide_run"><a href="#n531">531</a></p>
<p id="n532" class="pln"><a href="#n532">532</a></p>
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<p id="n541" class="pln"><a href="#n541">541</a></p>
<p id="n542" class="stm run hide_run"><a href="#n542">542</a></p>
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<p id="n544" class="pln"><a href="#n544">544</a></p>
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<p id="n554" class="stm run hide_run"><a href="#n554">554</a></p>
<p id="n555" class="pln"><a href="#n555">555</a></p>
<p id="n556" class="pln"><a href="#n556">556</a></p>
<p id="n557" class="pln"><a href="#n557">557</a></p>
<p id="n558" class="stm mis"><a href="#n558">558</a></p>
<p id="n559" class="pln"><a href="#n559">559</a></p>
<p id="n560" class="stm run hide_run"><a href="#n560">560</a></p>
<p id="n561" class="pln"><a href="#n561">561</a></p>
<p id="n562" class="pln"><a href="#n562">562</a></p>
<p id="n563" class="pln"><a href="#n563">563</a></p>
<p id="n564" class="pln"><a href="#n564">564</a></p>
<p id="n565" class="pln"><a href="#n565">565</a></p>
<p id="n566" class="stm mis"><a href="#n566">566</a></p>

            </td>
            <td class="text">
<p id="t1" class="stm run hide_run"><span class="key">import</span> <span class="nam">datetime</span><span class="strut">&nbsp;</span></p>
<p id="t2" class="stm run hide_run"><span class="key">import</span> <span class="nam">decimal</span><span class="strut">&nbsp;</span></p>
<p id="t3" class="stm run hide_run"><span class="key">import</span> <span class="nam">warnings</span><span class="strut">&nbsp;</span></p>
<p id="t4" class="stm run hide_run"><span class="key">from</span> <span class="nam">importlib</span> <span class="key">import</span> <span class="nam">import_module</span><span class="strut">&nbsp;</span></p>
<p id="t5" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t6" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">conf</span> <span class="key">import</span> <span class="nam">settings</span><span class="strut">&nbsp;</span></p>
<p id="t7" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">db</span><span class="op">.</span><span class="nam">backends</span> <span class="key">import</span> <span class="nam">utils</span><span class="strut">&nbsp;</span></p>
<p id="t8" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">utils</span> <span class="key">import</span> <span class="nam">six</span><span class="op">,</span> <span class="nam">timezone</span><span class="strut">&nbsp;</span></p>
<p id="t9" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">utils</span><span class="op">.</span><span class="nam">dateparse</span> <span class="key">import</span> <span class="nam">parse_duration</span><span class="strut">&nbsp;</span></p>
<p id="t10" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">utils</span><span class="op">.</span><span class="nam">deprecation</span> <span class="key">import</span> <span class="nam">RemovedInDjango19Warning</span><span class="strut">&nbsp;</span></p>
<p id="t11" class="stm run hide_run"><span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">utils</span><span class="op">.</span><span class="nam">encoding</span> <span class="key">import</span> <span class="nam">force_text</span><span class="strut">&nbsp;</span></p>
<p id="t12" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t13" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t14" class="stm run hide_run"><span class="key">class</span> <span class="nam">BaseDatabaseOperations</span><span class="op">(</span><span class="nam">object</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t15" class="pln">    <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t16" class="pln"><span class="str">    This class encapsulates all backend-specific differences, such as the way</span><span class="strut">&nbsp;</span></p>
<p id="t17" class="pln"><span class="str">    a backend performs ordering or calculates the ID of a recently-inserted</span><span class="strut">&nbsp;</span></p>
<p id="t18" class="pln"><span class="str">    row.</span><span class="strut">&nbsp;</span></p>
<p id="t19" class="pln"><span class="str">    """</span><span class="strut">&nbsp;</span></p>
<p id="t20" class="stm run hide_run">    <span class="nam">compiler_module</span> <span class="op">=</span> <span class="str">"django.db.models.sql.compiler"</span><span class="strut">&nbsp;</span></p>
<p id="t21" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t22" class="pln">    <span class="com"># Integer field safe ranges by `internal_type` as documented</span><span class="strut">&nbsp;</span></p>
<p id="t23" class="pln">    <span class="com"># in docs/ref/models/fields.txt.</span><span class="strut">&nbsp;</span></p>
<p id="t24" class="stm run hide_run">    <span class="nam">integer_field_ranges</span> <span class="op">=</span> <span class="op">{</span><span class="strut">&nbsp;</span></p>
<p id="t25" class="pln">        <span class="str">'SmallIntegerField'</span><span class="op">:</span> <span class="op">(</span><span class="op">-</span><span class="num">32768</span><span class="op">,</span> <span class="num">32767</span><span class="op">)</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t26" class="pln">        <span class="str">'IntegerField'</span><span class="op">:</span> <span class="op">(</span><span class="op">-</span><span class="num">2147483648</span><span class="op">,</span> <span class="num">2147483647</span><span class="op">)</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t27" class="pln">        <span class="str">'BigIntegerField'</span><span class="op">:</span> <span class="op">(</span><span class="op">-</span><span class="num">9223372036854775808</span><span class="op">,</span> <span class="num">9223372036854775807</span><span class="op">)</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t28" class="pln">        <span class="str">'PositiveSmallIntegerField'</span><span class="op">:</span> <span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="num">32767</span><span class="op">)</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t29" class="pln">        <span class="str">'PositiveIntegerField'</span><span class="op">:</span> <span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="num">2147483647</span><span class="op">)</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t30" class="pln">    <span class="op">}</span><span class="strut">&nbsp;</span></p>
<p id="t31" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t32" class="stm run hide_run">    <span class="key">def</span> <span class="nam">__init__</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">connection</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t33" class="stm run hide_run">        <span class="nam">self</span><span class="op">.</span><span class="nam">connection</span> <span class="op">=</span> <span class="nam">connection</span><span class="strut">&nbsp;</span></p>
<p id="t34" class="stm run hide_run">        <span class="nam">self</span><span class="op">.</span><span class="nam">_cache</span> <span class="op">=</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t35" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t36" class="stm run hide_run">    <span class="key">def</span> <span class="nam">autoinc_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">table</span><span class="op">,</span> <span class="nam">column</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t37" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t38" class="pln"><span class="str">        Returns any SQL needed to support auto-incrementing primary keys, or</span><span class="strut">&nbsp;</span></p>
<p id="t39" class="pln"><span class="str">        None if no SQL is necessary.</span><span class="strut">&nbsp;</span></p>
<p id="t40" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t41" class="pln"><span class="str">        This SQL is executed when a table is created.</span><span class="strut">&nbsp;</span></p>
<p id="t42" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t43" class="stm mis">        <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t44" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t45" class="stm run hide_run">    <span class="key">def</span> <span class="nam">bulk_batch_size</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">fields</span><span class="op">,</span> <span class="nam">objs</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t46" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t47" class="pln"><span class="str">        Returns the maximum allowed batch size for the backend. The fields</span><span class="strut">&nbsp;</span></p>
<p id="t48" class="pln"><span class="str">        are the fields going to be inserted in the batch, the objs contains</span><span class="strut">&nbsp;</span></p>
<p id="t49" class="pln"><span class="str">        all the objects to be inserted.</span><span class="strut">&nbsp;</span></p>
<p id="t50" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t51" class="stm mis">        <span class="key">return</span> <span class="nam">len</span><span class="op">(</span><span class="nam">objs</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t52" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t53" class="stm run hide_run">    <span class="key">def</span> <span class="nam">cache_key_culling_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t54" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t55" class="pln"><span class="str">        Returns an SQL query that retrieves the first cache key greater than the</span><span class="strut">&nbsp;</span></p>
<p id="t56" class="pln"><span class="str">        n smallest.</span><span class="strut">&nbsp;</span></p>
<p id="t57" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t58" class="pln"><span class="str">        This is used by the 'db' cache backend to determine where to start</span><span class="strut">&nbsp;</span></p>
<p id="t59" class="pln"><span class="str">        culling.</span><span class="strut">&nbsp;</span></p>
<p id="t60" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t61" class="stm mis">        <span class="key">return</span> <span class="str">"SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s"</span><span class="strut">&nbsp;</span></p>
<p id="t62" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t63" class="stm run hide_run">    <span class="key">def</span> <span class="nam">unification_cast_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">output_field</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t64" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t65" class="pln"><span class="str">        Given a field instance, returns the SQL necessary to cast the result of</span><span class="strut">&nbsp;</span></p>
<p id="t66" class="pln"><span class="str">        a union to that type. Note that the resulting string should contain a</span><span class="strut">&nbsp;</span></p>
<p id="t67" class="pln"><span class="str">        '%s' placeholder for the expression being cast.</span><span class="strut">&nbsp;</span></p>
<p id="t68" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t69" class="stm mis">        <span class="key">return</span> <span class="str">'%s'</span><span class="strut">&nbsp;</span></p>
<p id="t70" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t71" class="stm run hide_run">    <span class="key">def</span> <span class="nam">date_extract_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">,</span> <span class="nam">field_name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t72" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t73" class="pln"><span class="str">        Given a lookup_type of 'year', 'month' or 'day', returns the SQL that</span><span class="strut">&nbsp;</span></p>
<p id="t74" class="pln"><span class="str">        extracts a value from the given date field field_name.</span><span class="strut">&nbsp;</span></p>
<p id="t75" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t76" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a date_extract_sql() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t77" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t78" class="stm run hide_run">    <span class="key">def</span> <span class="nam">date_interval_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">timedelta</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t79" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t80" class="pln"><span class="str">        Implements the date interval functionality for expressions</span><span class="strut">&nbsp;</span></p>
<p id="t81" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t82" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a date_interval_sql() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t83" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t84" class="stm run hide_run">    <span class="key">def</span> <span class="nam">date_trunc_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">,</span> <span class="nam">field_name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t85" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t86" class="pln"><span class="str">        Given a lookup_type of 'year', 'month' or 'day', returns the SQL that</span><span class="strut">&nbsp;</span></p>
<p id="t87" class="pln"><span class="str">        truncates the given date field field_name to a date object with only</span><span class="strut">&nbsp;</span></p>
<p id="t88" class="pln"><span class="str">        the given specificity.</span><span class="strut">&nbsp;</span></p>
<p id="t89" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t90" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a datetrunc_sql() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t91" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t92" class="stm run hide_run">    <span class="key">def</span> <span class="nam">datetime_cast_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t93" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t94" class="pln"><span class="str">        Returns the SQL necessary to cast a datetime value so that it will be</span><span class="strut">&nbsp;</span></p>
<p id="t95" class="pln"><span class="str">        retrieved as a Python datetime object instead of a string.</span><span class="strut">&nbsp;</span></p>
<p id="t96" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t97" class="pln"><span class="str">        This SQL should include a '%s' in place of the field's name.</span><span class="strut">&nbsp;</span></p>
<p id="t98" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t99" class="stm mis">        <span class="key">return</span> <span class="str">"%s"</span><span class="strut">&nbsp;</span></p>
<p id="t100" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t101" class="stm run hide_run">    <span class="key">def</span> <span class="nam">datetime_extract_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">,</span> <span class="nam">field_name</span><span class="op">,</span> <span class="nam">tzname</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t102" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t103" class="pln"><span class="str">        Given a lookup_type of 'year', 'month', 'day', 'hour', 'minute' or</span><span class="strut">&nbsp;</span></p>
<p id="t104" class="pln"><span class="str">        'second', returns the SQL that extracts a value from the given</span><span class="strut">&nbsp;</span></p>
<p id="t105" class="pln"><span class="str">        datetime field field_name, and a tuple of parameters.</span><span class="strut">&nbsp;</span></p>
<p id="t106" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t107" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a datetime_extract_sql() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t108" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t109" class="stm run hide_run">    <span class="key">def</span> <span class="nam">datetime_trunc_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">,</span> <span class="nam">field_name</span><span class="op">,</span> <span class="nam">tzname</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t110" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t111" class="pln"><span class="str">        Given a lookup_type of 'year', 'month', 'day', 'hour', 'minute' or</span><span class="strut">&nbsp;</span></p>
<p id="t112" class="pln"><span class="str">        'second', returns the SQL that truncates the given datetime field</span><span class="strut">&nbsp;</span></p>
<p id="t113" class="pln"><span class="str">        field_name to a datetime object with only the given specificity, and</span><span class="strut">&nbsp;</span></p>
<p id="t114" class="pln"><span class="str">        a tuple of parameters.</span><span class="strut">&nbsp;</span></p>
<p id="t115" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t116" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a datetime_trunk_sql() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t117" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t118" class="stm run hide_run">    <span class="key">def</span> <span class="nam">deferrable_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t119" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t120" class="pln"><span class="str">        Returns the SQL necessary to make a constraint "initially deferred"</span><span class="strut">&nbsp;</span></p>
<p id="t121" class="pln"><span class="str">        during a CREATE TABLE statement.</span><span class="strut">&nbsp;</span></p>
<p id="t122" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t123" class="stm mis">        <span class="key">return</span> <span class="str">''</span><span class="strut">&nbsp;</span></p>
<p id="t124" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t125" class="stm run hide_run">    <span class="key">def</span> <span class="nam">distinct_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">fields</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t126" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t127" class="pln"><span class="str">        Returns an SQL DISTINCT clause which removes duplicate rows from the</span><span class="strut">&nbsp;</span></p>
<p id="t128" class="pln"><span class="str">        result set. If any fields are given, only the given fields are being</span><span class="strut">&nbsp;</span></p>
<p id="t129" class="pln"><span class="str">        checked for duplicates.</span><span class="strut">&nbsp;</span></p>
<p id="t130" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t131" class="stm mis">        <span class="key">if</span> <span class="nam">fields</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t132" class="stm mis">            <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'DISTINCT ON fields is not supported by this database backend'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t133" class="pln">        <span class="key">else</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t134" class="stm mis">            <span class="key">return</span> <span class="str">'DISTINCT'</span><span class="strut">&nbsp;</span></p>
<p id="t135" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t136" class="stm run hide_run">    <span class="key">def</span> <span class="nam">drop_foreignkey_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t137" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t138" class="pln"><span class="str">        Returns the SQL command that drops a foreign key.</span><span class="strut">&nbsp;</span></p>
<p id="t139" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t140" class="stm mis">        <span class="key">return</span> <span class="str">"DROP CONSTRAINT"</span><span class="strut">&nbsp;</span></p>
<p id="t141" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t142" class="stm run hide_run">    <span class="key">def</span> <span class="nam">drop_sequence_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">table</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t143" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t144" class="pln"><span class="str">        Returns any SQL necessary to drop the sequence for the given table.</span><span class="strut">&nbsp;</span></p>
<p id="t145" class="pln"><span class="str">        Returns None if no SQL is necessary.</span><span class="strut">&nbsp;</span></p>
<p id="t146" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t147" class="stm mis">        <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t148" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t149" class="stm run hide_run">    <span class="key">def</span> <span class="nam">fetch_returned_insert_id</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">cursor</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t150" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t151" class="pln"><span class="str">        Given a cursor object that has just performed an INSERT...RETURNING</span><span class="strut">&nbsp;</span></p>
<p id="t152" class="pln"><span class="str">        statement into a table that has an auto-incrementing ID, returns the</span><span class="strut">&nbsp;</span></p>
<p id="t153" class="pln"><span class="str">        newly created ID.</span><span class="strut">&nbsp;</span></p>
<p id="t154" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t155" class="stm mis">        <span class="key">return</span> <span class="nam">cursor</span><span class="op">.</span><span class="nam">fetchone</span><span class="op">(</span><span class="op">)</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t156" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t157" class="stm run hide_run">    <span class="key">def</span> <span class="nam">field_cast_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">db_type</span><span class="op">,</span> <span class="nam">internal_type</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t158" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t159" class="pln"><span class="str">        Given a column type (e.g. 'BLOB', 'VARCHAR'), and an internal type</span><span class="strut">&nbsp;</span></p>
<p id="t160" class="pln"><span class="str">        (e.g. 'GenericIPAddressField'), returns the SQL necessary to cast it</span><span class="strut">&nbsp;</span></p>
<p id="t161" class="pln"><span class="str">        before using it in a WHERE statement. Note that the resulting string</span><span class="strut">&nbsp;</span></p>
<p id="t162" class="pln"><span class="str">        should contain a '%s' placeholder for the column being searched against.</span><span class="strut">&nbsp;</span></p>
<p id="t163" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t164" class="stm mis">        <span class="key">return</span> <span class="str">'%s'</span><span class="strut">&nbsp;</span></p>
<p id="t165" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t166" class="stm run hide_run">    <span class="key">def</span> <span class="nam">force_no_ordering</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t167" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t168" class="pln"><span class="str">        Returns a list used in the "ORDER BY" clause to force no ordering at</span><span class="strut">&nbsp;</span></p>
<p id="t169" class="pln"><span class="str">        all. Returning an empty list means that nothing will be included in the</span><span class="strut">&nbsp;</span></p>
<p id="t170" class="pln"><span class="str">        ordering.</span><span class="strut">&nbsp;</span></p>
<p id="t171" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t172" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t173" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t174" class="stm run hide_run">    <span class="key">def</span> <span class="nam">for_update_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">nowait</span><span class="op">=</span><span class="nam">False</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t175" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t176" class="pln"><span class="str">        Returns the FOR UPDATE SQL clause to lock rows for an update operation.</span><span class="strut">&nbsp;</span></p>
<p id="t177" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t178" class="stm mis">        <span class="key">if</span> <span class="nam">nowait</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t179" class="stm mis">            <span class="key">return</span> <span class="str">'FOR UPDATE NOWAIT'</span><span class="strut">&nbsp;</span></p>
<p id="t180" class="pln">        <span class="key">else</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t181" class="stm mis">            <span class="key">return</span> <span class="str">'FOR UPDATE'</span><span class="strut">&nbsp;</span></p>
<p id="t182" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t183" class="stm run hide_run">    <span class="key">def</span> <span class="nam">fulltext_search_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">field_name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t184" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t185" class="pln"><span class="str">        Returns the SQL WHERE clause to use in order to perform a full-text</span><span class="strut">&nbsp;</span></p>
<p id="t186" class="pln"><span class="str">        search of the given field_name. Note that the resulting string should</span><span class="strut">&nbsp;</span></p>
<p id="t187" class="pln"><span class="str">        contain a '%s' placeholder for the value being searched against.</span><span class="strut">&nbsp;</span></p>
<p id="t188" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t189" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'Full-text search is not implemented for this database backend'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t190" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t191" class="stm run hide_run">    <span class="key">def</span> <span class="nam">last_executed_query</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">cursor</span><span class="op">,</span> <span class="nam">sql</span><span class="op">,</span> <span class="nam">params</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t192" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t193" class="pln"><span class="str">        Returns a string of the query last executed by the given cursor, with</span><span class="strut">&nbsp;</span></p>
<p id="t194" class="pln"><span class="str">        placeholders replaced with actual values.</span><span class="strut">&nbsp;</span></p>
<p id="t195" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t196" class="pln"><span class="str">        `sql` is the raw query containing placeholders, and `params` is the</span><span class="strut">&nbsp;</span></p>
<p id="t197" class="pln"><span class="str">        sequence of parameters. These are used by default, but this method</span><span class="strut">&nbsp;</span></p>
<p id="t198" class="pln"><span class="str">        exists for database backends to provide a better implementation</span><span class="strut">&nbsp;</span></p>
<p id="t199" class="pln"><span class="str">        according to their own quoting schemes.</span><span class="strut">&nbsp;</span></p>
<p id="t200" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t201" class="pln">        <span class="com"># Convert params to contain Unicode values.</span><span class="strut">&nbsp;</span></p>
<p id="t202" class="stm mis">        <span class="nam">to_unicode</span> <span class="op">=</span> <span class="key">lambda</span> <span class="nam">s</span><span class="op">:</span> <span class="nam">force_text</span><span class="op">(</span><span class="nam">s</span><span class="op">,</span> <span class="nam">strings_only</span><span class="op">=</span><span class="nam">True</span><span class="op">,</span> <span class="nam">errors</span><span class="op">=</span><span class="str">'replace'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t203" class="stm mis">        <span class="key">if</span> <span class="nam">isinstance</span><span class="op">(</span><span class="nam">params</span><span class="op">,</span> <span class="op">(</span><span class="nam">list</span><span class="op">,</span> <span class="nam">tuple</span><span class="op">)</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t204" class="stm mis">            <span class="nam">u_params</span> <span class="op">=</span> <span class="nam">tuple</span><span class="op">(</span><span class="nam">to_unicode</span><span class="op">(</span><span class="nam">val</span><span class="op">)</span> <span class="key">for</span> <span class="nam">val</span> <span class="key">in</span> <span class="nam">params</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t205" class="stm mis">        <span class="key">elif</span> <span class="nam">params</span> <span class="key">is</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t206" class="stm mis">            <span class="nam">u_params</span> <span class="op">=</span> <span class="op">(</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t207" class="pln">        <span class="key">else</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t208" class="stm mis">            <span class="nam">u_params</span> <span class="op">=</span> <span class="op">{</span><span class="nam">to_unicode</span><span class="op">(</span><span class="nam">k</span><span class="op">)</span><span class="op">:</span> <span class="nam">to_unicode</span><span class="op">(</span><span class="nam">v</span><span class="op">)</span> <span class="key">for</span> <span class="nam">k</span><span class="op">,</span> <span class="nam">v</span> <span class="key">in</span> <span class="nam">params</span><span class="op">.</span><span class="nam">items</span><span class="op">(</span><span class="op">)</span><span class="op">}</span><span class="strut">&nbsp;</span></p>
<p id="t209" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t210" class="stm mis">        <span class="key">return</span> <span class="nam">six</span><span class="op">.</span><span class="nam">text_type</span><span class="op">(</span><span class="str">"QUERY = %r - PARAMS = %r"</span><span class="op">)</span> <span class="op">%</span> <span class="op">(</span><span class="nam">sql</span><span class="op">,</span> <span class="nam">u_params</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t211" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t212" class="stm run hide_run">    <span class="key">def</span> <span class="nam">last_insert_id</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">cursor</span><span class="op">,</span> <span class="nam">table_name</span><span class="op">,</span> <span class="nam">pk_name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t213" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t214" class="pln"><span class="str">        Given a cursor object that has just performed an INSERT statement into</span><span class="strut">&nbsp;</span></p>
<p id="t215" class="pln"><span class="str">        a table that has an auto-incrementing ID, returns the newly created ID.</span><span class="strut">&nbsp;</span></p>
<p id="t216" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t217" class="pln"><span class="str">        This method also receives the table name and the name of the primary-key</span><span class="strut">&nbsp;</span></p>
<p id="t218" class="pln"><span class="str">        column.</span><span class="strut">&nbsp;</span></p>
<p id="t219" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t220" class="stm mis">        <span class="key">return</span> <span class="nam">cursor</span><span class="op">.</span><span class="nam">lastrowid</span><span class="strut">&nbsp;</span></p>
<p id="t221" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t222" class="stm run hide_run">    <span class="key">def</span> <span class="nam">lookup_cast</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">,</span> <span class="nam">internal_type</span><span class="op">=</span><span class="nam">None</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t223" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t224" class="pln"><span class="str">        Returns the string to use in a query when performing lookups</span><span class="strut">&nbsp;</span></p>
<p id="t225" class="pln"><span class="str">        ("contains", "like", etc). The resulting string should contain a '%s'</span><span class="strut">&nbsp;</span></p>
<p id="t226" class="pln"><span class="str">        placeholder for the column being searched against.</span><span class="strut">&nbsp;</span></p>
<p id="t227" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t228" class="stm mis">        <span class="key">return</span> <span class="str">"%s"</span><span class="strut">&nbsp;</span></p>
<p id="t229" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t230" class="stm run hide_run">    <span class="key">def</span> <span class="nam">max_in_list_size</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t231" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t232" class="pln"><span class="str">        Returns the maximum number of items that can be passed in a single 'IN'</span><span class="strut">&nbsp;</span></p>
<p id="t233" class="pln"><span class="str">        list condition, or None if the backend does not impose a limit.</span><span class="strut">&nbsp;</span></p>
<p id="t234" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t235" class="stm mis">        <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t236" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t237" class="stm run hide_run">    <span class="key">def</span> <span class="nam">max_name_length</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t238" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t239" class="pln"><span class="str">        Returns the maximum length of table and column names, or None if there</span><span class="strut">&nbsp;</span></p>
<p id="t240" class="pln"><span class="str">        is no limit.</span><span class="strut">&nbsp;</span></p>
<p id="t241" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t242" class="stm mis">        <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t243" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t244" class="stm run hide_run">    <span class="key">def</span> <span class="nam">no_limit_value</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t245" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t246" class="pln"><span class="str">        Returns the value to use for the LIMIT when we are wanting "LIMIT</span><span class="strut">&nbsp;</span></p>
<p id="t247" class="pln"><span class="str">        infinity". Returns None if the limit clause can be omitted in this case.</span><span class="strut">&nbsp;</span></p>
<p id="t248" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t249" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a no_limit_value() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t250" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t251" class="stm run hide_run">    <span class="key">def</span> <span class="nam">pk_default_value</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t252" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t253" class="pln"><span class="str">        Returns the value to use during an INSERT statement to specify that</span><span class="strut">&nbsp;</span></p>
<p id="t254" class="pln"><span class="str">        the field should use its default value.</span><span class="strut">&nbsp;</span></p>
<p id="t255" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t256" class="stm mis">        <span class="key">return</span> <span class="str">'DEFAULT'</span><span class="strut">&nbsp;</span></p>
<p id="t257" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t258" class="stm run hide_run">    <span class="key">def</span> <span class="nam">prepare_sql_script</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">sql</span><span class="op">,</span> <span class="nam">_allow_fallback</span><span class="op">=</span><span class="nam">False</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t259" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t260" class="pln"><span class="str">        Takes a SQL script that may contain multiple lines and returns a list</span><span class="strut">&nbsp;</span></p>
<p id="t261" class="pln"><span class="str">        of statements to feed to successive cursor.execute() calls.</span><span class="strut">&nbsp;</span></p>
<p id="t262" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t263" class="pln"><span class="str">        Since few databases are able to process raw SQL scripts in a single</span><span class="strut">&nbsp;</span></p>
<p id="t264" class="pln"><span class="str">        cursor.execute() call and PEP 249 doesn't talk about this use case,</span><span class="strut">&nbsp;</span></p>
<p id="t265" class="pln"><span class="str">        the default implementation is conservative.</span><span class="strut">&nbsp;</span></p>
<p id="t266" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t267" class="pln">        <span class="com"># Remove _allow_fallback and keep only 'return ...' in Django 1.9.</span><span class="strut">&nbsp;</span></p>
<p id="t268" class="stm mis">        <span class="key">try</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t269" class="pln">            <span class="com"># This import must stay inside the method because it's optional.</span><span class="strut">&nbsp;</span></p>
<p id="t270" class="stm mis">            <span class="key">import</span> <span class="nam">sqlparse</span><span class="strut">&nbsp;</span></p>
<p id="t271" class="stm mis">        <span class="key">except</span> <span class="nam">ImportError</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t272" class="stm mis">            <span class="key">if</span> <span class="nam">_allow_fallback</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t273" class="pln">                <span class="com"># Without sqlparse, fall back to the legacy (and buggy) logic.</span><span class="strut">&nbsp;</span></p>
<p id="t274" class="stm mis">                <span class="nam">warnings</span><span class="op">.</span><span class="nam">warn</span><span class="op">(</span><span class="strut">&nbsp;</span></p>
<p id="t275" class="pln">                    <span class="str">"Providing initial SQL data on a %s database will require "</span><span class="strut">&nbsp;</span></p>
<p id="t276" class="pln">                    <span class="str">"sqlparse in Django 1.9."</span> <span class="op">%</span> <span class="nam">self</span><span class="op">.</span><span class="nam">connection</span><span class="op">.</span><span class="nam">vendor</span><span class="op">,</span><span class="strut">&nbsp;</span></p>
<p id="t277" class="pln">                    <span class="nam">RemovedInDjango19Warning</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t278" class="stm mis">                <span class="key">from</span> <span class="nam">django</span><span class="op">.</span><span class="nam">core</span><span class="op">.</span><span class="nam">management</span><span class="op">.</span><span class="nam">sql</span> <span class="key">import</span> <span class="nam">_split_statements</span><span class="strut">&nbsp;</span></p>
<p id="t279" class="stm mis">                <span class="key">return</span> <span class="nam">_split_statements</span><span class="op">(</span><span class="nam">sql</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t280" class="pln">            <span class="key">else</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t281" class="stm mis">                <span class="key">raise</span><span class="strut">&nbsp;</span></p>
<p id="t282" class="pln">        <span class="key">else</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t283" class="stm mis">            <span class="key">return</span> <span class="op">[</span><span class="nam">sqlparse</span><span class="op">.</span><span class="nam">format</span><span class="op">(</span><span class="nam">statement</span><span class="op">,</span> <span class="nam">strip_comments</span><span class="op">=</span><span class="nam">True</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t284" class="pln">                    <span class="key">for</span> <span class="nam">statement</span> <span class="key">in</span> <span class="nam">sqlparse</span><span class="op">.</span><span class="nam">split</span><span class="op">(</span><span class="nam">sql</span><span class="op">)</span> <span class="key">if</span> <span class="nam">statement</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t285" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t286" class="stm run hide_run">    <span class="key">def</span> <span class="nam">process_clob</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t287" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t288" class="pln"><span class="str">        Returns the value of a CLOB column, for backends that return a locator</span><span class="strut">&nbsp;</span></p>
<p id="t289" class="pln"><span class="str">        object that requires additional processing.</span><span class="strut">&nbsp;</span></p>
<p id="t290" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t291" class="stm mis">        <span class="key">return</span> <span class="nam">value</span><span class="strut">&nbsp;</span></p>
<p id="t292" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t293" class="stm run hide_run">    <span class="key">def</span> <span class="nam">return_insert_id</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t294" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t295" class="pln"><span class="str">        For backends that support returning the last insert ID as part</span><span class="strut">&nbsp;</span></p>
<p id="t296" class="pln"><span class="str">        of an insert query, this method returns the SQL and params to</span><span class="strut">&nbsp;</span></p>
<p id="t297" class="pln"><span class="str">        append to the INSERT query. The returned fragment should</span><span class="strut">&nbsp;</span></p>
<p id="t298" class="pln"><span class="str">        contain a format string to hold the appropriate column.</span><span class="strut">&nbsp;</span></p>
<p id="t299" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t300" class="stm mis">        <span class="key">pass</span><span class="strut">&nbsp;</span></p>
<p id="t301" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t302" class="stm run hide_run">    <span class="key">def</span> <span class="nam">compiler</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">compiler_name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t303" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t304" class="pln"><span class="str">        Returns the SQLCompiler class corresponding to the given name,</span><span class="strut">&nbsp;</span></p>
<p id="t305" class="pln"><span class="str">        in the namespace corresponding to the `compiler_module` attribute</span><span class="strut">&nbsp;</span></p>
<p id="t306" class="pln"><span class="str">        on this backend.</span><span class="strut">&nbsp;</span></p>
<p id="t307" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t308" class="stm mis">        <span class="key">if</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_cache</span> <span class="key">is</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t309" class="stm mis">            <span class="nam">self</span><span class="op">.</span><span class="nam">_cache</span> <span class="op">=</span> <span class="nam">import_module</span><span class="op">(</span><span class="nam">self</span><span class="op">.</span><span class="nam">compiler_module</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t310" class="stm mis">        <span class="key">return</span> <span class="nam">getattr</span><span class="op">(</span><span class="nam">self</span><span class="op">.</span><span class="nam">_cache</span><span class="op">,</span> <span class="nam">compiler_name</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t311" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t312" class="stm run hide_run">    <span class="key">def</span> <span class="nam">quote_name</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">name</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t313" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t314" class="pln"><span class="str">        Returns a quoted version of the given table, index or column name. Does</span><span class="strut">&nbsp;</span></p>
<p id="t315" class="pln"><span class="str">        not quote the given name if it's already been quoted.</span><span class="strut">&nbsp;</span></p>
<p id="t316" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t317" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a quote_name() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t318" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t319" class="stm run hide_run">    <span class="key">def</span> <span class="nam">random_function_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t320" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t321" class="pln"><span class="str">        Returns an SQL expression that returns a random value.</span><span class="strut">&nbsp;</span></p>
<p id="t322" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t323" class="stm mis">        <span class="key">return</span> <span class="str">'RANDOM()'</span><span class="strut">&nbsp;</span></p>
<p id="t324" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t325" class="stm run hide_run">    <span class="key">def</span> <span class="nam">regex_lookup</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">lookup_type</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t326" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t327" class="pln"><span class="str">        Returns the string to use in a query when performing regular expression</span><span class="strut">&nbsp;</span></p>
<p id="t328" class="pln"><span class="str">        lookups (using "regex" or "iregex"). The resulting string should</span><span class="strut">&nbsp;</span></p>
<p id="t329" class="pln"><span class="str">        contain a '%s' placeholder for the column being searched against.</span><span class="strut">&nbsp;</span></p>
<p id="t330" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t331" class="pln"><span class="str">        If the feature is not supported (or part of it is not supported), a</span><span class="strut">&nbsp;</span></p>
<p id="t332" class="pln"><span class="str">        NotImplementedError exception can be raised.</span><span class="strut">&nbsp;</span></p>
<p id="t333" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t334" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations may require a regex_lookup() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t335" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t336" class="stm run hide_run">    <span class="key">def</span> <span class="nam">savepoint_create_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">sid</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t337" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t338" class="pln"><span class="str">        Returns the SQL for starting a new savepoint. Only required if the</span><span class="strut">&nbsp;</span></p>
<p id="t339" class="pln"><span class="str">        "uses_savepoints" feature is True. The "sid" parameter is a string</span><span class="strut">&nbsp;</span></p>
<p id="t340" class="pln"><span class="str">        for the savepoint id.</span><span class="strut">&nbsp;</span></p>
<p id="t341" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t342" class="stm mis">        <span class="key">return</span> <span class="str">"SAVEPOINT %s"</span> <span class="op">%</span> <span class="nam">self</span><span class="op">.</span><span class="nam">quote_name</span><span class="op">(</span><span class="nam">sid</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t343" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t344" class="stm run hide_run">    <span class="key">def</span> <span class="nam">savepoint_commit_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">sid</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t345" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t346" class="pln"><span class="str">        Returns the SQL for committing the given savepoint.</span><span class="strut">&nbsp;</span></p>
<p id="t347" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t348" class="stm mis">        <span class="key">return</span> <span class="str">"RELEASE SAVEPOINT %s"</span> <span class="op">%</span> <span class="nam">self</span><span class="op">.</span><span class="nam">quote_name</span><span class="op">(</span><span class="nam">sid</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t349" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t350" class="stm run hide_run">    <span class="key">def</span> <span class="nam">savepoint_rollback_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">sid</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t351" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t352" class="pln"><span class="str">        Returns the SQL for rolling back the given savepoint.</span><span class="strut">&nbsp;</span></p>
<p id="t353" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t354" class="stm mis">        <span class="key">return</span> <span class="str">"ROLLBACK TO SAVEPOINT %s"</span> <span class="op">%</span> <span class="nam">self</span><span class="op">.</span><span class="nam">quote_name</span><span class="op">(</span><span class="nam">sid</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t355" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t356" class="stm run hide_run">    <span class="key">def</span> <span class="nam">set_time_zone_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t357" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t358" class="pln"><span class="str">        Returns the SQL that will set the connection's time zone.</span><span class="strut">&nbsp;</span></p>
<p id="t359" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t360" class="pln"><span class="str">        Returns '' if the backend doesn't support time zones.</span><span class="strut">&nbsp;</span></p>
<p id="t361" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t362" class="stm mis">        <span class="key">return</span> <span class="str">''</span><span class="strut">&nbsp;</span></p>
<p id="t363" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t364" class="stm run hide_run">    <span class="key">def</span> <span class="nam">sql_flush</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">style</span><span class="op">,</span> <span class="nam">tables</span><span class="op">,</span> <span class="nam">sequences</span><span class="op">,</span> <span class="nam">allow_cascade</span><span class="op">=</span><span class="nam">False</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t365" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t366" class="pln"><span class="str">        Returns a list of SQL statements required to remove all data from</span><span class="strut">&nbsp;</span></p>
<p id="t367" class="pln"><span class="str">        the given database tables (without actually removing the tables</span><span class="strut">&nbsp;</span></p>
<p id="t368" class="pln"><span class="str">        themselves).</span><span class="strut">&nbsp;</span></p>
<p id="t369" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t370" class="pln"><span class="str">        The returned value also includes SQL statements required to reset DB</span><span class="strut">&nbsp;</span></p>
<p id="t371" class="pln"><span class="str">        sequences passed in :param sequences:.</span><span class="strut">&nbsp;</span></p>
<p id="t372" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t373" class="pln"><span class="str">        The `style` argument is a Style object as returned by either</span><span class="strut">&nbsp;</span></p>
<p id="t374" class="pln"><span class="str">        color_style() or no_style() in django.core.management.color.</span><span class="strut">&nbsp;</span></p>
<p id="t375" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t376" class="pln"><span class="str">        The `allow_cascade` argument determines whether truncation may cascade</span><span class="strut">&nbsp;</span></p>
<p id="t377" class="pln"><span class="str">        to tables with foreign keys pointing the tables being truncated.</span><span class="strut">&nbsp;</span></p>
<p id="t378" class="pln"><span class="str">        PostgreSQL requires a cascade even if these tables are empty.</span><span class="strut">&nbsp;</span></p>
<p id="t379" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t380" class="stm mis">        <span class="key">raise</span> <span class="nam">NotImplementedError</span><span class="op">(</span><span class="str">'subclasses of BaseDatabaseOperations must provide a sql_flush() method'</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t381" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t382" class="stm run hide_run">    <span class="key">def</span> <span class="nam">sequence_reset_by_name_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">style</span><span class="op">,</span> <span class="nam">sequences</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t383" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t384" class="pln"><span class="str">        Returns a list of the SQL statements required to reset sequences</span><span class="strut">&nbsp;</span></p>
<p id="t385" class="pln"><span class="str">        passed in :param sequences:.</span><span class="strut">&nbsp;</span></p>
<p id="t386" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t387" class="pln"><span class="str">        The `style` argument is a Style object as returned by either</span><span class="strut">&nbsp;</span></p>
<p id="t388" class="pln"><span class="str">        color_style() or no_style() in django.core.management.color.</span><span class="strut">&nbsp;</span></p>
<p id="t389" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t390" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t391" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t392" class="stm run hide_run">    <span class="key">def</span> <span class="nam">sequence_reset_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">style</span><span class="op">,</span> <span class="nam">model_list</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t393" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t394" class="pln"><span class="str">        Returns a list of the SQL statements required to reset sequences for</span><span class="strut">&nbsp;</span></p>
<p id="t395" class="pln"><span class="str">        the given models.</span><span class="strut">&nbsp;</span></p>
<p id="t396" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t397" class="pln"><span class="str">        The `style` argument is a Style object as returned by either</span><span class="strut">&nbsp;</span></p>
<p id="t398" class="pln"><span class="str">        color_style() or no_style() in django.core.management.color.</span><span class="strut">&nbsp;</span></p>
<p id="t399" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t400" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="op">]</span>  <span class="com"># No sequence reset required by default.</span><span class="strut">&nbsp;</span></p>
<p id="t401" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t402" class="stm run hide_run">    <span class="key">def</span> <span class="nam">start_transaction_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t403" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t404" class="pln"><span class="str">        Returns the SQL statement required to start a transaction.</span><span class="strut">&nbsp;</span></p>
<p id="t405" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t406" class="stm mis">        <span class="key">return</span> <span class="str">"BEGIN;"</span><span class="strut">&nbsp;</span></p>
<p id="t407" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t408" class="stm run hide_run">    <span class="key">def</span> <span class="nam">end_transaction_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">success</span><span class="op">=</span><span class="nam">True</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t409" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t410" class="pln"><span class="str">        Returns the SQL statement required to end a transaction.</span><span class="strut">&nbsp;</span></p>
<p id="t411" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t412" class="stm mis">        <span class="key">if</span> <span class="key">not</span> <span class="nam">success</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t413" class="stm mis">            <span class="key">return</span> <span class="str">"ROLLBACK;"</span><span class="strut">&nbsp;</span></p>
<p id="t414" class="stm mis">        <span class="key">return</span> <span class="str">"COMMIT;"</span><span class="strut">&nbsp;</span></p>
<p id="t415" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t416" class="stm run hide_run">    <span class="key">def</span> <span class="nam">tablespace_sql</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">tablespace</span><span class="op">,</span> <span class="nam">inline</span><span class="op">=</span><span class="nam">False</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t417" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t418" class="pln"><span class="str">        Returns the SQL that will be used in a query to define the tablespace.</span><span class="strut">&nbsp;</span></p>
<p id="t419" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t420" class="pln"><span class="str">        Returns '' if the backend doesn't support tablespaces.</span><span class="strut">&nbsp;</span></p>
<p id="t421" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t422" class="pln"><span class="str">        If inline is True, the SQL is appended to a row; otherwise it's appended</span><span class="strut">&nbsp;</span></p>
<p id="t423" class="pln"><span class="str">        to the entire CREATE TABLE or CREATE INDEX statement.</span><span class="strut">&nbsp;</span></p>
<p id="t424" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t425" class="stm mis">        <span class="key">return</span> <span class="str">''</span><span class="strut">&nbsp;</span></p>
<p id="t426" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t427" class="stm run hide_run">    <span class="key">def</span> <span class="nam">prep_for_like_query</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">x</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t428" class="pln">        <span class="str">"""Prepares a value for use in a LIKE query."""</span><span class="strut">&nbsp;</span></p>
<p id="t429" class="stm mis">        <span class="key">return</span> <span class="nam">force_text</span><span class="op">(</span><span class="nam">x</span><span class="op">)</span><span class="op">.</span><span class="nam">replace</span><span class="op">(</span><span class="str">"\\"</span><span class="op">,</span> <span class="str">"\\\\"</span><span class="op">)</span><span class="op">.</span><span class="nam">replace</span><span class="op">(</span><span class="str">"%"</span><span class="op">,</span> <span class="str">"\%"</span><span class="op">)</span><span class="op">.</span><span class="nam">replace</span><span class="op">(</span><span class="str">"_"</span><span class="op">,</span> <span class="str">"\_"</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t430" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t431" class="pln">    <span class="com"># Same as prep_for_like_query(), but called for "iexact" matches, which</span><span class="strut">&nbsp;</span></p>
<p id="t432" class="pln">    <span class="com"># need not necessarily be implemented using "LIKE" in the backend.</span><span class="strut">&nbsp;</span></p>
<p id="t433" class="stm run hide_run">    <span class="nam">prep_for_iexact_query</span> <span class="op">=</span> <span class="nam">prep_for_like_query</span><span class="strut">&nbsp;</span></p>
<p id="t434" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t435" class="stm run hide_run">    <span class="key">def</span> <span class="nam">validate_autopk_value</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t436" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t437" class="pln"><span class="str">        Certain backends do not accept some values for "serial" fields</span><span class="strut">&nbsp;</span></p>
<p id="t438" class="pln"><span class="str">        (for example zero in MySQL). This method will raise a ValueError</span><span class="strut">&nbsp;</span></p>
<p id="t439" class="pln"><span class="str">        if the value is invalid, otherwise returns validated value.</span><span class="strut">&nbsp;</span></p>
<p id="t440" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t441" class="stm mis">        <span class="key">return</span> <span class="nam">value</span><span class="strut">&nbsp;</span></p>
<p id="t442" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t443" class="stm run hide_run">    <span class="key">def</span> <span class="nam">value_to_db_date</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t444" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t445" class="pln"><span class="str">        Transforms a date value to an object compatible with what is expected</span><span class="strut">&nbsp;</span></p>
<p id="t446" class="pln"><span class="str">        by the backend driver for date columns.</span><span class="strut">&nbsp;</span></p>
<p id="t447" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t448" class="stm mis">        <span class="key">if</span> <span class="nam">value</span> <span class="key">is</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t449" class="stm mis">            <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t450" class="stm mis">        <span class="key">return</span> <span class="nam">six</span><span class="op">.</span><span class="nam">text_type</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t451" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t452" class="stm run hide_run">    <span class="key">def</span> <span class="nam">value_to_db_datetime</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t453" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t454" class="pln"><span class="str">        Transforms a datetime value to an object compatible with what is expected</span><span class="strut">&nbsp;</span></p>
<p id="t455" class="pln"><span class="str">        by the backend driver for datetime columns.</span><span class="strut">&nbsp;</span></p>
<p id="t456" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t457" class="stm mis">        <span class="key">if</span> <span class="nam">value</span> <span class="key">is</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t458" class="stm mis">            <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t459" class="stm mis">        <span class="key">return</span> <span class="nam">six</span><span class="op">.</span><span class="nam">text_type</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t460" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t461" class="stm run hide_run">    <span class="key">def</span> <span class="nam">value_to_db_time</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t462" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t463" class="pln"><span class="str">        Transforms a time value to an object compatible with what is expected</span><span class="strut">&nbsp;</span></p>
<p id="t464" class="pln"><span class="str">        by the backend driver for time columns.</span><span class="strut">&nbsp;</span></p>
<p id="t465" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t466" class="stm mis">        <span class="key">if</span> <span class="nam">value</span> <span class="key">is</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t467" class="stm mis">            <span class="key">return</span> <span class="nam">None</span><span class="strut">&nbsp;</span></p>
<p id="t468" class="stm mis">        <span class="key">if</span> <span class="nam">timezone</span><span class="op">.</span><span class="nam">is_aware</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t469" class="stm mis">            <span class="key">raise</span> <span class="nam">ValueError</span><span class="op">(</span><span class="str">"Django does not support timezone-aware times."</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t470" class="stm mis">        <span class="key">return</span> <span class="nam">six</span><span class="op">.</span><span class="nam">text_type</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t471" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t472" class="stm run hide_run">    <span class="key">def</span> <span class="nam">value_to_db_decimal</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">,</span> <span class="nam">max_digits</span><span class="op">,</span> <span class="nam">decimal_places</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t473" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t474" class="pln"><span class="str">        Transforms a decimal.Decimal value to an object compatible with what is</span><span class="strut">&nbsp;</span></p>
<p id="t475" class="pln"><span class="str">        expected by the backend driver for decimal (numeric) columns.</span><span class="strut">&nbsp;</span></p>
<p id="t476" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t477" class="stm mis">        <span class="key">return</span> <span class="nam">utils</span><span class="op">.</span><span class="nam">format_number</span><span class="op">(</span><span class="nam">value</span><span class="op">,</span> <span class="nam">max_digits</span><span class="op">,</span> <span class="nam">decimal_places</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t478" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t479" class="stm run hide_run">    <span class="key">def</span> <span class="nam">value_to_db_ipaddress</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t480" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t481" class="pln"><span class="str">        Transforms a string representation of an IP address into the expected</span><span class="strut">&nbsp;</span></p>
<p id="t482" class="pln"><span class="str">        type for the backend driver.</span><span class="strut">&nbsp;</span></p>
<p id="t483" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t484" class="stm mis">        <span class="key">return</span> <span class="nam">value</span><span class="strut">&nbsp;</span></p>
<p id="t485" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t486" class="stm run hide_run">    <span class="key">def</span> <span class="nam">year_lookup_bounds_for_date_field</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t487" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t488" class="pln"><span class="str">        Returns a two-elements list with the lower and upper bound to be used</span><span class="strut">&nbsp;</span></p>
<p id="t489" class="pln"><span class="str">        with a BETWEEN operator to query a DateField value using a year</span><span class="strut">&nbsp;</span></p>
<p id="t490" class="pln"><span class="str">        lookup.</span><span class="strut">&nbsp;</span></p>
<p id="t491" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t492" class="pln"><span class="str">        `value` is an int, containing the looked-up year.</span><span class="strut">&nbsp;</span></p>
<p id="t493" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t494" class="stm mis">        <span class="nam">first</span> <span class="op">=</span> <span class="nam">datetime</span><span class="op">.</span><span class="nam">date</span><span class="op">(</span><span class="nam">value</span><span class="op">,</span> <span class="num">1</span><span class="op">,</span> <span class="num">1</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t495" class="stm mis">        <span class="nam">second</span> <span class="op">=</span> <span class="nam">datetime</span><span class="op">.</span><span class="nam">date</span><span class="op">(</span><span class="nam">value</span><span class="op">,</span> <span class="num">12</span><span class="op">,</span> <span class="num">31</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t496" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="nam">first</span><span class="op">,</span> <span class="nam">second</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t497" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t498" class="stm run hide_run">    <span class="key">def</span> <span class="nam">year_lookup_bounds_for_datetime_field</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t499" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t500" class="pln"><span class="str">        Returns a two-elements list with the lower and upper bound to be used</span><span class="strut">&nbsp;</span></p>
<p id="t501" class="pln"><span class="str">        with a BETWEEN operator to query a DateTimeField value using a year</span><span class="strut">&nbsp;</span></p>
<p id="t502" class="pln"><span class="str">        lookup.</span><span class="strut">&nbsp;</span></p>
<p id="t503" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t504" class="pln"><span class="str">        `value` is an int, containing the looked-up year.</span><span class="strut">&nbsp;</span></p>
<p id="t505" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t506" class="stm mis">        <span class="nam">first</span> <span class="op">=</span> <span class="nam">datetime</span><span class="op">.</span><span class="nam">datetime</span><span class="op">(</span><span class="nam">value</span><span class="op">,</span> <span class="num">1</span><span class="op">,</span> <span class="num">1</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t507" class="stm mis">        <span class="nam">second</span> <span class="op">=</span> <span class="nam">datetime</span><span class="op">.</span><span class="nam">datetime</span><span class="op">(</span><span class="nam">value</span><span class="op">,</span> <span class="num">12</span><span class="op">,</span> <span class="num">31</span><span class="op">,</span> <span class="num">23</span><span class="op">,</span> <span class="num">59</span><span class="op">,</span> <span class="num">59</span><span class="op">,</span> <span class="num">999999</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t508" class="stm mis">        <span class="key">if</span> <span class="nam">settings</span><span class="op">.</span><span class="nam">USE_TZ</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t509" class="stm mis">            <span class="nam">tz</span> <span class="op">=</span> <span class="nam">timezone</span><span class="op">.</span><span class="nam">get_current_timezone</span><span class="op">(</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t510" class="stm mis">            <span class="nam">first</span> <span class="op">=</span> <span class="nam">timezone</span><span class="op">.</span><span class="nam">make_aware</span><span class="op">(</span><span class="nam">first</span><span class="op">,</span> <span class="nam">tz</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t511" class="stm mis">            <span class="nam">second</span> <span class="op">=</span> <span class="nam">timezone</span><span class="op">.</span><span class="nam">make_aware</span><span class="op">(</span><span class="nam">second</span><span class="op">,</span> <span class="nam">tz</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t512" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="nam">first</span><span class="op">,</span> <span class="nam">second</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t513" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t514" class="stm run hide_run">    <span class="key">def</span> <span class="nam">get_db_converters</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">expression</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t515" class="pln">        <span class="str">"""Get a list of functions needed to convert field data.</span><span class="strut">&nbsp;</span></p>
<p id="t516" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t517" class="pln"><span class="str">        Some field types on some backends do not provide data in the correct</span><span class="strut">&nbsp;</span></p>
<p id="t518" class="pln"><span class="str">        format, this is the hook for coverter functions.</span><span class="strut">&nbsp;</span></p>
<p id="t519" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t520" class="stm mis">        <span class="key">return</span> <span class="op">[</span><span class="op">]</span><span class="strut">&nbsp;</span></p>
<p id="t521" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t522" class="stm run hide_run">    <span class="key">def</span> <span class="nam">convert_durationfield_value</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">value</span><span class="op">,</span> <span class="nam">expression</span><span class="op">,</span> <span class="nam">connection</span><span class="op">,</span> <span class="nam">context</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t523" class="stm mis">        <span class="key">if</span> <span class="nam">value</span> <span class="key">is</span> <span class="key">not</span> <span class="nam">None</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t524" class="stm mis">            <span class="nam">value</span> <span class="op">=</span> <span class="nam">str</span><span class="op">(</span><span class="nam">decimal</span><span class="op">.</span><span class="nam">Decimal</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span> <span class="op">/</span> <span class="nam">decimal</span><span class="op">.</span><span class="nam">Decimal</span><span class="op">(</span><span class="num">1000000</span><span class="op">)</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t525" class="stm mis">            <span class="nam">value</span> <span class="op">=</span> <span class="nam">parse_duration</span><span class="op">(</span><span class="nam">value</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t526" class="stm mis">        <span class="key">return</span> <span class="nam">value</span><span class="strut">&nbsp;</span></p>
<p id="t527" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t528" class="stm run hide_run">    <span class="key">def</span> <span class="nam">check_aggregate_support</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">aggregate_func</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t529" class="stm mis">        <span class="key">return</span> <span class="nam">self</span><span class="op">.</span><span class="nam">check_expression_support</span><span class="op">(</span><span class="nam">aggregate_func</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t530" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t531" class="stm run hide_run">    <span class="key">def</span> <span class="nam">check_expression_support</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">expression</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t532" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t533" class="pln"><span class="str">        Check that the backend supports the provided expression.</span><span class="strut">&nbsp;</span></p>
<p id="t534" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t535" class="pln"><span class="str">        This is used on specific backends to rule out known expressions</span><span class="strut">&nbsp;</span></p>
<p id="t536" class="pln"><span class="str">        that have problematic or nonexistent implementations. If the</span><span class="strut">&nbsp;</span></p>
<p id="t537" class="pln"><span class="str">        expression has a known problem, the backend should raise</span><span class="strut">&nbsp;</span></p>
<p id="t538" class="pln"><span class="str">        NotImplementedError.</span><span class="strut">&nbsp;</span></p>
<p id="t539" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t540" class="stm mis">        <span class="key">pass</span><span class="strut">&nbsp;</span></p>
<p id="t541" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t542" class="stm run hide_run">    <span class="key">def</span> <span class="nam">combine_expression</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">connector</span><span class="op">,</span> <span class="nam">sub_expressions</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t543" class="pln">        <span class="str">"""Combine a list of subexpressions into a single expression, using</span><span class="strut">&nbsp;</span></p>
<p id="t544" class="pln"><span class="str">        the provided connecting operator. This is required because operators</span><span class="strut">&nbsp;</span></p>
<p id="t545" class="pln"><span class="str">        can vary between backends (e.g., Oracle with %% and &amp;) and between</span><span class="strut">&nbsp;</span></p>
<p id="t546" class="pln"><span class="str">        subexpression types (e.g., date expressions)</span><span class="strut">&nbsp;</span></p>
<p id="t547" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t548" class="stm mis">        <span class="nam">conn</span> <span class="op">=</span> <span class="str">' %s '</span> <span class="op">%</span> <span class="nam">connector</span><span class="strut">&nbsp;</span></p>
<p id="t549" class="stm mis">        <span class="key">return</span> <span class="nam">conn</span><span class="op">.</span><span class="nam">join</span><span class="op">(</span><span class="nam">sub_expressions</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t550" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t551" class="stm run hide_run">    <span class="key">def</span> <span class="nam">combine_duration_expression</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">connector</span><span class="op">,</span> <span class="nam">sub_expressions</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t552" class="stm mis">        <span class="key">return</span> <span class="nam">self</span><span class="op">.</span><span class="nam">combine_expression</span><span class="op">(</span><span class="nam">connector</span><span class="op">,</span> <span class="nam">sub_expressions</span><span class="op">)</span><span class="strut">&nbsp;</span></p>
<p id="t553" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t554" class="stm run hide_run">    <span class="key">def</span> <span class="nam">modify_insert_params</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">placeholders</span><span class="op">,</span> <span class="nam">params</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t555" class="pln">        <span class="str">"""Allow modification of insert parameters. Needed for Oracle Spatial</span><span class="strut">&nbsp;</span></p>
<p id="t556" class="pln"><span class="str">        backend due to #10888.</span><span class="strut">&nbsp;</span></p>
<p id="t557" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t558" class="stm mis">        <span class="key">return</span> <span class="nam">params</span><span class="strut">&nbsp;</span></p>
<p id="t559" class="pln"><span class="strut">&nbsp;</span></p>
<p id="t560" class="stm run hide_run">    <span class="key">def</span> <span class="nam">integer_field_range</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">internal_type</span><span class="op">)</span><span class="op">:</span><span class="strut">&nbsp;</span></p>
<p id="t561" class="pln">        <span class="str">"""</span><span class="strut">&nbsp;</span></p>
<p id="t562" class="pln"><span class="str">        Given an integer field internal type (e.g. 'PositiveIntegerField'),</span><span class="strut">&nbsp;</span></p>
<p id="t563" class="pln"><span class="str">        returns a tuple of the (min_value, max_value) form representing the</span><span class="strut">&nbsp;</span></p>
<p id="t564" class="pln"><span class="str">        range of the column type bound to the field.</span><span class="strut">&nbsp;</span></p>
<p id="t565" class="pln"><span class="str">        """</span><span class="strut">&nbsp;</span></p>
<p id="t566" class="stm mis">        <span class="key">return</span> <span class="nam">self</span><span class="op">.</span><span class="nam">integer_field_ranges</span><span class="op">[</span><span class="nam">internal_type</span><span class="op">]</span><span class="strut">&nbsp;</span></p>

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